Key for brake shoes and hangers



May 13, 1924.

1,493,887 s. MIDURA KEY FOR BRAKE SHOES AND HANGERS Filed Aug;-l0 1923 vwemtoz Sianzbhwllidzzm Patented May 13, 1924.

STANISLAW HIDURA, F PERTH AMBOY, NEW JERSEY.

KEY non. BRAKE saons Am) HANGERS.

Application filed August 10,1923. Serial No. 656,787.

To all whom it may concern: 7

Be it knownthat I, STANISLAW MIDURA,

a citizen of United States, residing at Perth Amboy, in the county of Middlesex and State of New Jersey, have'invented certain new and useful Improvements in Keysfor Brake Shoes and Hangers, of which the following is a specification.

This invention relates to keys for brake shoes and hangers, the same being an imrovement on the device patented by me on %ecember 5, 1922 and numbered 1,438,049.

The object of this invention is to provide means for resiliently retaining the key in its operative position, but which permits its removalupon the application of force to the head of the key without the necessity of manipulating the detent.

This object is accomplished by the construction and arrangement of parts, including the key, as hereafter described and shown in the accompanying drawing, forming? part of this disclosure, and in which igure 1 is a side elevational view of a conventional form of brake-head and shoe, partially in section to show the application of the key and its retainer.

Figure 2 is a erspective view ofthe key and retainer in etai Figure 3 is an enlarged fragmentary detail view showing the hanger su port.

In the drawin the numeral 5 esignates any conventiona ty e of brake-head having the customary ugs 6 and 7, against which the brake shoe 8 is seated, the shoe having a projection 9 on its convex side suited to enter between the lugs 6 and 7, when 0 eratively' positioned. a

The ugs 6 and 7and shoe projection 9 have alined openings to receive the key 10 by which the shoe and the head are locked.

together, the key having an extending angular outturned head 10 The shank of the key is curved and tapered so that when driven into the position shown in Figure 1 the shoe is drawn into firm contact with the head 5.

At a point midway in the length of the key, in its concave side, is a longitudinal recess 11 of uniform depth, and seated on thesurface of the'bottom of the recess are the 'flat ends 12 of a semi-elli tical spring 13,

its bowed central portion ing outward.

The ends of the spring contain slots 14 through which pass the shanks of studs 15 having enlarged headscontacting with the outer surface of the spring ends, the bodies of the studs being rigidly fixed in the key as shown.

As illustrated in Figure 3, such brakeheads are supported by beams 16 fixed transversely on the ends of the car, the beams having brackets 17 in which are pivoted the ends of looped supports 18, the bights of the loops engaging in openings in the brakehead as indicated.

In operation, the shoe is placed in position on the head and the key driven through the openings in the head and its lugs, also passingthrough the projection 9 to lock it in place.

Due to the resiliency of the sprin its outbowed portion readily yields under orce, flattening into the recess 11, until it has passed the lug 7, and then springing out to engage the edge of the same, acting to positively prevent loosening or withdrawal of the key by the shocks, jars and vibrations to which devices are commonly subjected to.

To remove the key, its outturned head is engaged by a lever to withdraw the key, the spring again flattening by reason of the force applied, this movement being made possible because of the slots 14 moving relative to the fixed studs 15, the heads of which clear the projection and lugs when passing.

Although the foregoing is the preferred form of the embodiment of the invention, it is understood that minor changes may be made without departing from the scope or spirit of the appended claims.

Having thus described my invention and set forth the manner of its construction and application, what I claim as new and desire to secure by Letters Patent, is

1. A key of the class described comprising a curved body of oblong rectangular cross section, a head on said body, said body tapering in thickness from head to point, there being an elongated recess of uniform depth in the concave side of said body, headed studs fixed in said body to extend into the recess, and a flat semi-elliptical spring disposed in the recess, said spring haviing slots in its ends engaged by said stu s.

2. A key of the class described comprising cess, said ends'having elon ated slots, and a curved body of oblong rectangular cross studs fixed in the bottom 0 the recess ensection, a head on said body, said body gaging the slots, said studs having heads 10 tapering in thickness from head to point, confining the spring within the recess. 5 there being, an elongated recess of uniform In witness whereof I have aflixed my depth in the concave side of said body, an signature. outbowed springhaving fiat ends in the re- STANISLAW 

